EP0622704A2 - Aufladeelement, Aufladevorrichtung, Arbeitseinheit und Bilderzeugungsgerät - Google Patents

Aufladeelement, Aufladevorrichtung, Arbeitseinheit und Bilderzeugungsgerät Download PDF

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Publication number
EP0622704A2
EP0622704A2 EP94303065A EP94303065A EP0622704A2 EP 0622704 A2 EP0622704 A2 EP 0622704A2 EP 94303065 A EP94303065 A EP 94303065A EP 94303065 A EP94303065 A EP 94303065A EP 0622704 A2 EP0622704 A2 EP 0622704A2
Authority
EP
European Patent Office
Prior art keywords
charging
foamed layer
layer
charging member
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94303065A
Other languages
English (en)
French (fr)
Other versions
EP0622704A3 (en
EP0622704B1 (de
Inventor
Satoru C/O Canon Kabushiki Kaisha Inami
Masaharu C/O Canon Kabushiki Kaisha Ohkubo
Junichi C/O Canon Kabushiki Kaisha Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0622704A2 publication Critical patent/EP0622704A2/de
Publication of EP0622704A3 publication Critical patent/EP0622704A3/en
Application granted granted Critical
Publication of EP0622704B1 publication Critical patent/EP0622704B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0208—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus
    • G03G15/0216—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers
    • G03G15/0233—Structure, details of the charging member, e.g. chemical composition, surface properties

Definitions

  • Figure 6 is a sectional view of an end portion of the charging member.
  • Figure 13 is a sectional view of the process cartridge C.
  • the process cartridge C may contain at least a photosensitive member 1 and a charging roller 2.
  • the inventors have empirically confirmed that the charging noise is influenced more by the specific gravity of the foamed material 2b than the hardness thereof, in the charging member having a foamed material 2b and an intermediate resistance layer 2d.
  • the specific gravity of the foamed material 2b can be reduced by increasing the diameter of the pores 2b' by increasing foaming ratio of the foamed material 2b, or by increasing the number of pores 2b'. As a result, the energy of vibration of the charging member 2 can be reduced, thus reducing the produced charging noise level.
  • Figure 3 is a graph of the noise level relative to the specific gravity of the foamed material 2b. The hardness of the charging member 2 is approx. 45 degrees (Asker-C). From the graph of Figure 3, it will be understood that the specific gravity of the foamed material 2b is preferably 0.6 g/cm3 for the purpose of suppressing the noise to the non-uncomfortable level (not more than 50 dB).
  • the foamed material 2b is covered with a film of several tens microns of very low weight. The volume of the film can be neglected.
  • the material is placed in water, to determine the volume w (cm3) is determined.
  • the temperature of the water is 4 °C.
  • the specific gravity is m/w, where m (g) is a mass of the foamed material 2b.
  • the intermediate layer 2d is backed up by the foamed material 2b, and therefore, the shape thereof is maintained in good order although the thickness is small, and therefore, it is not apart from the surface of the photosensitive drum 1 even if the charging member is deformed upon being press-contacted to the surface of the photosensitive drum 1. Thus, it is closely press-contacted to the surface of the photosensitive drum 1 over the entire length. Accordingly, no improper charging occurs even if the length of the charging member 2 is increased.
  • the contact charging device of this embodiment is placed in anechoic chamber, and the produced noise (charging noise) is measured in the above-described oscillating voltage application.
  • the measurement is carried out in accordance with ISO 7779, paragraph 6.
  • the produced charging noise of the conventional solid charging roller is 55 dB, and that of the charging roller of this embodiment is as low as 40 dB.
  • the reduction of the charging noise is provided even if the pores are independent or continuous.
  • the measured noise of the charging roller 2 is 40 dB (ISO 7779-6).
  • Figure 7 is a longitudinal sectional view of the charging member of this embodiment.
  • Figure 8 is a sectional view adjacent an end thereof.
  • Foamed material 2b foamed epychlorohydrin rubber in which carbon is dispersed Specific gravity of 0.4 g/cm3 Volume resistivity of 102 - 106 ⁇ .cm Layer thickness; of 2.6 mm and a length of 230 mm
  • Tube 2f thermo-curing polyurethane elastomer Volume resistivity of 103 - 109 ⁇ .cm Layer thickness of 250 ⁇ m
  • Foamed member 2b formed polypropylene in which conductive powder is dispersed Specific gravity of 0.55 g/cm3 Volume resistivity of 102 - 108 ⁇ .cm Width of 10 mm, length of 260 mm and thickness of 3 mm
  • Conductive layer 2c EPDM or urethane material in which a large amount of carbon or tin oxide or another electroconductive powder is dispersed Volume resistivity of 102 - 105 ⁇ .cm Layer thickness of 80 ⁇ m
  • Intermediate resistance layer 2d epychlorohydrin rubber Volume resistivity of 107 - 109 ⁇ .cm Layer thickness of 100 ⁇ m
  • Protection layer 2d N-methoxymethyl nylon Volume resistivity of 107 - 1012 ⁇ .cm Layer thickness of 30 ⁇ m
  • Hardness of the charging blade 2A 45 degrees (ASKER-C) Free length L of the charging blade 2A: 5 mm Total pressure to the photosensitive drum; 700 g
  • a cross-section of the foamed material is observed through optical microscope, and the outer diameters of the pores are measured at about 50 positions, and the average is obtained.
  • the optical microscope is OPTIPHOT, available from Nikon Kabushiki Kaisha, Japan, and the outer diameter is measured using LUZEX3, available from Nireco.
  • the average outer diameter of the pores 2b' is preferably not more than 1 mm.
  • the Charging member when the average wall thickness between the pores of the foamed material is small, the Charging member can be easily deformed at the contact portion with the drum. If this occurs, improper charging results.
  • the average wall thickness between the pores is preferably not less than 1 mm.
  • a cross-section of the foamed material is observed through optical microscope, and the outer diameters of the pores are measured at about 50 positions, and the average is obtained.
  • the optical microscope is OPTIPHOT, available from Nikon Kabushiki Kaisha, Japan, and the outer diameter is measured using LUZEX3, available from Nireco.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP94303065A 1993-04-28 1994-04-27 Aufladeelement, Arbeitseinheit und Bilderzeugungsgerät Expired - Lifetime EP0622704B1 (de)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP12808893 1993-04-28
JP12808893 1993-04-28
JP128088/93 1993-04-28
JP19289193 1993-07-06
JP19289193 1993-07-06
JP192891/93 1993-07-06
JP80411/94 1994-04-19
JP8041194 1994-04-19
JP6080411A JPH0792775A (ja) 1993-04-28 1994-04-19 帯電部材、帯電装置、プロセスカートリッジ及び画像形成装置

Publications (3)

Publication Number Publication Date
EP0622704A2 true EP0622704A2 (de) 1994-11-02
EP0622704A3 EP0622704A3 (en) 1995-11-15
EP0622704B1 EP0622704B1 (de) 2000-12-06

Family

ID=27303294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94303065A Expired - Lifetime EP0622704B1 (de) 1993-04-28 1994-04-27 Aufladeelement, Arbeitseinheit und Bilderzeugungsgerät

Country Status (6)

Country Link
US (1) US5543899A (de)
EP (1) EP0622704B1 (de)
JP (1) JPH0792775A (de)
DE (1) DE69426370T2 (de)
ES (1) ES2152289T3 (de)
HK (1) HK1011759A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0716354A2 (de) * 1994-12-07 1996-06-12 Canon Kabushiki Kaisha Verfahren zum Überholen einer Aufladewalze
EP0840176A2 (de) * 1993-07-30 1998-05-06 Canon Kabushiki Kaisha Aufladungsteil, Aufladungsvorrichtung und aus einem Bilderzeugungsgerät herausnehmbare Prozesskassette

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6052549A (en) * 1994-11-25 2000-04-18 Canon Kabushiki Kaisha Charging roller, and process cartridge and image-forming apparatus employing the roller
JP3268162B2 (ja) * 1995-04-28 2002-03-25 キヤノン株式会社 プロセスカートリッジ及び画像形成装置
JPH0973211A (ja) * 1995-09-05 1997-03-18 Canon Inc 帯電部材、プロセスカートリッジ及び画像形成装置
US5914742A (en) * 1996-11-27 1999-06-22 Lexmark International, Inc. Primary charge roller with protruding end
US5823929A (en) * 1996-12-20 1998-10-20 Genicom Corporation Reconditioning primary charge rollers for electrostatographic imaging machines
US6128462A (en) * 1998-04-02 2000-10-03 Canon Kabushiki Kaisha Cleaning member, image forming apparatus provided with a cleaning blade member, and process cartridge detachably attachable on the image forming apparatus
US6175703B1 (en) 1998-10-23 2001-01-16 Canon Kabushiki Kaisha Image forming apparatus and process cartridge
US6035163A (en) * 1998-11-20 2000-03-07 Xerox Corporation Vibration absorbing bias charge roll
US6169869B1 (en) 1999-01-28 2001-01-02 Canon Kabushiki Kaisha Image forming apparatus and process cartridge
JP3768712B2 (ja) 1999-02-09 2006-04-19 キヤノン株式会社 攪拌手段、現像装置、およびプロセスカートリッジ
US6317574B1 (en) 1999-02-25 2001-11-13 Canon Kabushiki Kaisha Charging member, process cartridge, and image forming apparatus
JP2001242684A (ja) 2000-03-01 2001-09-07 Canon Inc 画像形成装置及びプロセスカートリッジ
US6688335B2 (en) * 2000-07-14 2004-02-10 Suzuki Sogyo Co., Ltd. Liquid hammer prevention device
JP2002148903A (ja) * 2000-11-09 2002-05-22 Kiitekku:Kk 帯電ローラの再生方法
US6741824B2 (en) 2002-04-23 2004-05-25 Canon Kabushiki Kaisha Charging system, process cartridge and image forming apparatus
US7010246B2 (en) 2002-06-10 2006-03-07 Ricoh Company, Ltd. Image forming apparatus, drum unit, image forming module, and method of insertion and removal of a damper into and from an image carrier drum
US7035572B2 (en) * 2003-10-31 2006-04-25 Hewlett-Packard Development Company, L.P. Hard imaging device charging systems, electrophotography charging systems, hard imaging apparatuses, and hard imaging device electrophotography charging methods
US7835668B2 (en) * 2004-11-24 2010-11-16 Hewlett-Packard Development Company, L.P. Imaging methods, imaging member charging methods, and image engines
JP2006330483A (ja) * 2005-05-27 2006-12-07 Ricoh Co Ltd 導電性部材及びそれを有するプロセスカートリッジ、並びに、そのプロセスカートリッジを有する画像形成装置
US20070127935A1 (en) * 2005-11-30 2007-06-07 Canon Kabushiki Kaisha Image forming apparatus to which cartridges are detachably mountable
JP5264355B2 (ja) * 2008-07-31 2013-08-14 キヤノン株式会社 画像形成装置
JP5097195B2 (ja) * 2009-04-15 2012-12-12 東海ゴム工業株式会社 帯電ロール及びその製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823689A (en) * 1986-03-18 1989-04-25 Canon Kabushiki Kaisha Elastic roller with internal openings for use with image forming apparatus
EP0323252A2 (de) * 1987-12-29 1989-07-05 Kabushiki Kaisha Toshiba Gerät für das elektrophotographische Verfahren
EP0504877A2 (de) * 1991-03-20 1992-09-23 Canon Kabushiki Kaisha Aufladeelement, Aufladevorrichtung, Arbeitseinheit und Bilderzeugungsgerät mit einem Aufladeelement
EP0526235A2 (de) * 1991-07-31 1993-02-03 Canon Kabushiki Kaisha Aufladevorrichtung, Arbeitseinheit und Bilderzeugungsgerät

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB572738A (en) * 1941-11-10 1945-10-22 David Augustine Harper Improvements in polymeric materials
JPH05224506A (ja) * 1992-02-13 1993-09-03 Canon Inc 帯電装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823689A (en) * 1986-03-18 1989-04-25 Canon Kabushiki Kaisha Elastic roller with internal openings for use with image forming apparatus
EP0323252A2 (de) * 1987-12-29 1989-07-05 Kabushiki Kaisha Toshiba Gerät für das elektrophotographische Verfahren
EP0504877A2 (de) * 1991-03-20 1992-09-23 Canon Kabushiki Kaisha Aufladeelement, Aufladevorrichtung, Arbeitseinheit und Bilderzeugungsgerät mit einem Aufladeelement
EP0526235A2 (de) * 1991-07-31 1993-02-03 Canon Kabushiki Kaisha Aufladevorrichtung, Arbeitseinheit und Bilderzeugungsgerät

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0840176A2 (de) * 1993-07-30 1998-05-06 Canon Kabushiki Kaisha Aufladungsteil, Aufladungsvorrichtung und aus einem Bilderzeugungsgerät herausnehmbare Prozesskassette
EP0843231A2 (de) * 1993-07-30 1998-05-20 Canon Kabushiki Kaisha Aufladungsteil, Aufladevorrichtung und aus einem Bilderzeugungsgerät herausnehmbare Prozesskassette
EP0843231A3 (de) * 1993-07-30 1998-09-16 Canon Kabushiki Kaisha Aufladungsteil, Aufladevorrichtung und aus einem Bilderzeugungsgerät herausnehmbare Prozesskassette
EP0840176A3 (de) * 1993-07-30 1998-09-16 Canon Kabushiki Kaisha Aufladungsteil, Aufladungsvorrichtung und aus einem Bilderzeugungsgerät herausnehmbare Prozesskassette
EP0716354A2 (de) * 1994-12-07 1996-06-12 Canon Kabushiki Kaisha Verfahren zum Überholen einer Aufladewalze
EP0716354A3 (de) * 1994-12-07 1997-07-09 Canon Kk Verfahren zum Überholen einer Aufladewalze

Also Published As

Publication number Publication date
DE69426370T2 (de) 2001-05-17
HK1011759A1 (en) 1999-07-16
DE69426370D1 (de) 2001-01-11
JPH0792775A (ja) 1995-04-07
US5543899A (en) 1996-08-06
ES2152289T3 (es) 2001-02-01
EP0622704A3 (en) 1995-11-15
EP0622704B1 (de) 2000-12-06

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